CN101209961B - Method for preparing ferrous oxalate hydrated salt crystal - Google Patents
Method for preparing ferrous oxalate hydrated salt crystal Download PDFInfo
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- CN101209961B CN101209961B CN2006101726092A CN200610172609A CN101209961B CN 101209961 B CN101209961 B CN 101209961B CN 2006101726092 A CN2006101726092 A CN 2006101726092A CN 200610172609 A CN200610172609 A CN 200610172609A CN 101209961 B CN101209961 B CN 101209961B
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- aqueous solution
- oxalate
- divalent iron
- iron salt
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Abstract
The invention relates to a preparation method for a hydrous salt crystal of ferrous oxalate. The method comprises a contact reaction between water solution of oxalate and water solution of ferrous salt, which is carried out in the presence of mixed solvent of organic solvent and water; the organic solvent and water are totally soluble. The hydrous salt crystal of ferrous oxalate prepared by the method provided by the invention has small average grain size, as small as 1-5 micron, has good reactivity, and is suitable for being as compound raw material of lithium iron phosphate, an active substrate of anode of lithium-ion secondary batteries.
Description
Technical field
The present invention relates to a kind of preparation method of Ferrox hydrated salt crystal, particularly, be used for the preparation method of the Ferrox hydrated salt crystal of synthesizing lithium ferrous phosphate.
Background technology
At present, be cobalt acid lithium (LiCoO at lithium cell positive electrode material commonly used
2), lithium nickel cobalt dioxide (LiNi
xCo
1-xO
2), nickle cobalt lithium manganate (LiNi
xCo
yMn
1-x-yO
2) and lithium manganate (LiMn
2O
4).LiCoO
2, LiNi
xCo
1-xO
2And LiNi
xCo
yMn
1-x-yO
2Be the oxide compound of hexagonal layered salt structure, lithium ion moves in the octahedral layer gap that O-Co-O constitutes, and has higher electroconductibility and lithium ion and takes off the embedding reversibility.LiMn
2O
4Be the oxide compound of spinel three-dimensional structure, lithium ion moves in the octahedra stereo channel that O-Mn-O constitutes, and also has higher conductivity and lithium ion and takes off the embedding reversibility.They all are a large amount of positive electrode materials that use in the present lithium ion battery industry.But cobalt is one of less element of resource on the earth, and cobalt acid lithium (LiCoO
2), lithium nickel cobalt dioxide (LiNi
xCo
1-xO
2), nickle cobalt lithium manganate (LiNi
xCo
yMn
1-x-yO
2) over-charging of battery and when overheated can with electrolytic solution generation vigorous reaction, and emit a large amount of heats and cause battery to catch fire even explode.Therefore, cobalt acid lithium (LiCoO
2), lithium nickel cobalt dioxide (LiNi
xCo
1-xO
2), nickle cobalt lithium manganate (LiNi
xCo
yMn
1-x-yO
2) safety performance relatively poor, and cost height.Lithium manganate (LiMn
2O
4Though) comparatively cheap and safety, but not only loading capacity is less for it, and the cycle life under hot conditions is relatively poor, and its cycle life can't satisfy the requirement of actual use.
In order to solve the problem that exists in the above-mentioned lithium battery material, (A.K.Padhi such as texas,U.S college professor J.B.Goodenough, K.S.Najundaswamy, C.Masqueslier, S.Okadaand J.B.Goodenough, J.Electrochem.Soc.144,1609-1613 (1997)) academic article of delivering on U.S.'s electrochemistry magazine in 1997 discloses a kind of new lithium intercalation compound: lithium iron phosphate LiFePO
4Polycrystal.Its theoretical loading capacity can reach 170mAh/g, and has good safety performance, therefore is very suitable for the positive electrode material as the high-power drive pond.And lithium, iron and phosphorus all are the abundant elements of reserves on the earth, so its production cost is very low.
The Ferrox hydrated salt crystal industrial be to realize easily, so lithium iron phosphate LiFePO
4Use the synthetic lithium iron phosphate LiFePO of Ferrox
4Method is following reaction formula:
Li
2CO
3+2FeC
2O
4·2H
2O+2NH
4H
2PO
4→LiFePO
4+2NH
3+5CO
2+5H
2O+2H
2
This Ferrox crystallization be add in containing the aqueous solution of ferrous ion that oxalic acid or potassium oxalate make (right _ three oxalic acid close the preparation of iron III acid potassium _ improvement, Zheng Chenmou etc., university chemistry, 1999,14 (2)).But make the Ferrox hydrated salt crystal that obtains in this way, median size is the 10-80 micron.
Therefore, there is shortcomings such as needing reprocessing and reactive difference.Its result is difficult to the LiFePO as the positive active material use of lithium secondary battery
4The manufacturing raw material.
LiFePO 4 as the positive active material of lithium-ion secondary cell, for improving its specific conductivity, median size has better chemical property when being the 1-5 micron, and the median size of LiFePO 4 depends on the particle diameter of the synthesis material of LiFePO 4, and for the homogeneity and the reactivity of the mixing raw materials that improves when reaction, therefore, when requirement was synthesized as the LiFePO 4 of the positive active material of lithium-ion secondary cell, the particle diameter of Ferrox salt hydrate was the 1-5 micron.
Therefore, use Ferrox salt hydrate that the method for above-mentioned prior art obtains when being used for synthesizing lithium ferrous phosphate, need reprocessing and reactive poor, be difficult to synthesis material as the positive active material LiFePO 4 of lithium-ion secondary cell.
Summary of the invention
The objective of the invention is to overcome exist in the above-mentioned prior art as the synthesis material of the positive active material LiFePO 4 of lithium-ion secondary cell the time, the defective that granularity is big, need reprocessing and reactive difference, provide a kind of as the synthesis material of the positive active material LiFePO 4 of lithium-ion secondary cell the time, granularity is less, do not need to reprocess and the reactive preparation method of Ferrox hydrated salt crystal preferably.
The invention provides a kind of preparation method of Ferrox hydrated salt crystal, this method comprises the oxalate aqueous solution and divalent iron salt aqueous solution contact reacts, wherein, the contact reacts of described oxalate solution and divalent iron salt solution is carried out in the presence of the mixed solvent of organic solvent and water, and described organic solvent and water dissolve each other fully.
Adopt the Ferrox hydrated salt crystal of preparation method provided by the invention preparation, median size is the 1-5 micron, when synthetic positive active material LiFePO 4 as lithium-ion secondary cell, does not need reprocessing and reactive fine.And, the content of potassium and sodium is all reached below the 1 weight % of Ferrox hydrated salt crystal weight by to the sedimentary washing of Ferrox.Resulting Ferrox hydrated salt crystal is particularly suitable as the positive active material LiFePO of preparation lithium-ion secondary cell
4Or LiFeMePO
4The raw material of (Me is one or more among Mn, Co, Ni, Al and the Mg).
Description of drawings
The sem photograph of the Ferrox hydrated salt crystal that Fig. 1 obtains for embodiment 1;
The sem photograph of the Ferrox hydrated salt crystal that Fig. 2 obtains for embodiment 2;
The sem photograph of the Ferrox hydrated salt crystal that Fig. 3 obtains for embodiment 3;
The sem photograph of the Ferrox hydrated salt crystal that Fig. 4 obtains for comparative example 1;
The sem photograph of the Ferrox hydrated salt crystal that Fig. 5 obtains for comparative example 2;
The sem photograph of the Ferrox hydrated salt crystal that Fig. 6 obtains for comparative example 3.
Embodiment
The preparation method of Ferrox hydrated salt crystal provided by the invention, comprise the oxalate aqueous solution and divalent iron salt aqueous solution contact reacts, wherein, the contact reacts of described oxalate solution and divalent iron salt solution is carried out in the presence of the mixed solvent of organic solvent and water, and described organic solvent and water dissolve each other fully.
According to preparation method provided by the invention, the contact reacts of the described oxalate aqueous solution and the divalent iron salt aqueous solution is respectively the oxalate aqueous solution and the divalent iron salt aqueous solution to be joined in the mixed solvent of organic solvent and water.
According to preparation method provided by the invention, the pH value that the oxalate aqueous solution and divalent iron salt reactant aqueous solution are ended is preferably 1-5, more preferably 2-4.This pH value can be controlled by regulating the oxalate aqueous solution and divalent iron salt pH value of aqueous solution, that is,, be preferably 8-11 by adding alkali and the oxalate pH value of aqueous solution being adjusted to more than 8, by adding acid the divalent iron salt pH value of aqueous solution is adjusted to below 6, is preferably 1-3.
According to preparation method provided by the invention, in the preferred case, the oxalate in the described oxalate aqueous solution and the mol ratio of the divalent iron salt in the divalent iron salt aqueous solution are 0.5-1, more preferably 0.8-1.
According to preparation method provided by the invention, the concentration of the described oxalate aqueous solution is not particularly limited, as long as can fully dissolve oxalate, under the preferable case, the concentration of the described oxalate aqueous solution is the 0.8-1 mol; Concentration to the described oxalate aqueous solution is not particularly limited, as long as can fully dissolve oxalate, under the preferable case, the concentration of the described divalent iron salt aqueous solution is the 0.8-1 mol.
The present invention is to having no particular limits as spendable oxalate, so long as water soluble gets final product, under the preferable case, oxalate can be selected one or more in potassium oxalate, sodium oxalate and the ammonium oxalate for use, wherein an oxalic acid hydrate potassium (K
2C
2O
4H
2O) obtain easily for industrial, and solubleness being higher, is particularly preferred therefore.
The present invention is to being not particularly limited as spendable divalent iron salt, so long as water soluble gets final product, under the preferable case, divalent iron salt can be selected ferrous sulfate and/or iron protochloride for use, wherein, and ferrous sulfate (FeSO
47H
2O) obtain easily for industrial, and very cheap, be particularly preferred therefore.
According to preparation method provided by the invention, wherein, the alkali that is used to regulate the oxalate pH value of water solution can be any water-soluble alkali, in preferred potassium hydroxide, sodium hydroxide, saleratus and the sodium bicarbonate one or more, wherein potassium hydroxide is industrially to obtain easily, is particularly preferred therefore.The acid that is used to regulate the divalent iron salt pH value of water solution can be any water-soluble acid, one or more in preferably sulfuric acid, hydrochloric acid, nitric acid and the acetate, and wherein sulfuric acid is industrially to obtain easily, is particularly preferred therefore.
According to preparation method provided by the invention, in the preferred case, the mixed solvent of described organic solvent and water and the described oxalate aqueous solution and divalent iron salt aqueous solution volume ratio are 1: 4-10.
According to preparation method provided by the invention, the volume ratio of organic solvent and water is had no particular limits, can be preferably 2-10 for any ratio.The organic solvent that uses is had no particular limits, as long as can dissolve each other with water, one or more in preferred alcohol, ethylene glycol and the acetone, wherein ethanol is industrially to obtain easily, and very cheap, is particularly preferred thus.
According to preparation method provided by the invention, when the oxalate aqueous solution and divalent iron salt reactant aqueous solution, when oxalate denominationby and ferrous ion react in the presence of organic solvent, crystal can be separated out the generation nucleus rapidly, therefore can hinder crystalline grows up, carry out under the acid stronger condition and control to be reflected at, make the crystal grain of generation be difficult for reuniting, therefore resulting crystallization particle diameter is little, reactivity is good.
According to preparation method provided by the invention, the temperature of the oxalate aqueous solution and the divalent iron salt aqueous solution has no particular limits, and generally speaking, the temperature of the oxalate aqueous solution and the divalent iron salt aqueous solution is 5-80 ℃, is preferably 15-35 ℃.
This method also comprises the precipitate and separate with the described oxalate aqueous solution and described divalent iron salt aqueous solution contact reacts gained, with the gained washing of precipitate, dry, and dry described temperature of precipitation is 50-90 ℃, and described washing makes the metal content of the K of the Ferrox hydrated salt crystal that obtains after the drying and Na below 1 weight %.
Separate described precipitation and can adopt any known solid-liquid separating method to separate, for example filtration, centrifugation.
At the positive active material LiFePO that uses the preparation of Ferrox salt hydrate as lithium-ion secondary cell
4Or LiFeMePO
4When (Me is one or more among Mn, Co, Ni, Al and the Mg), low more good more as the K ion of impurity.For example Ferrox hydrated salt crystal and primary ammonium phosphate and Quilonum Retard are fired preparation LiFePO
4The time, this K ion forms potassiumphosphate, and the performance of battery is reduced.Thereby needing the described precipitation of water thorough washing, the K content that makes the Ferrox hydrated salt crystal that obtains is below the 1 weight %, is preferably below the 0.5 weight %.And, except the K content of the prepared Ferrox hydrated salt crystal of needs control the present invention, the content of impurity Na, Ca and Si also is preferably below the 1 weight %, more preferably below the 0.5 weight %, make resulting Ferrox hydrated salt crystal can be particularly suitable as the positive active material LiFePO of lithium-ion secondary cell
4Or LiFeMePO
4The preparation raw material.
Just dry, dry needed temperature is preferably 50-90 ℃, more preferably 70-80 ℃.
Adopt embodiment that the present invention is explained in further detail below.
Embodiment 1
With 1.0 liters of ethanol (C
2H
5OH) miscible with 0.2 premium on currency, make mixed solvent (25 ℃ of temperature).Ferrous sulfate (the FeSO of dissolving 556 grams (2 moles) in 2 premium on currency
47H
2O), and add a small amount of sulfuric acid, make the pH value of solution value be adjusted to 1.8.In 2 premium on currency, dissolve an oxalic acid hydrate potassium (K of 368 grams (2 moles) in addition
2C
2O
4H
2O), and add a small amount of potassium hydroxide (KOH) aqueous solution, make pH value of solution be adjusted to 8.6.With the speed of dripping of 50 ml/min, with drip 2000 milliliters Potassium Oxalate Solution of 40 fens these alcohol mixed solvents of clockwise, with the phase same rate, with drip 2000 milliliters copperas solution of 40 fens these mixed solvents of clockwise.Along with dripping of Potassium Oxalate Solution and copperas solution, Ferrox is separated out (25 ℃ of temperature, pH2.8).
Then, carry out the filtered and recycled Ferrox, the Ferrox that reclaims is washed with 10 premium on currency.
Then, dry 12 hours of the Ferrox after will washing under 80 ℃ obtains 330 gram dry products.With the dry product that X-ray diffraction analysis obtains, the diffractogram of this dry product is consistent with JCPDS figure number 23-0293, therefore confirms that dry product is FeC
2O
42H
2O (yield 92%).
Utilize the ICP optical spectroscopy to obtain the content of Fe, Na, K, Mn, Ni, Co, Ti.In addition, record SO with volumetry
4 2-Content.In addition, adopt X100 type particles distribution instrument (U.S. HONEYWELL) to utilize laser diffractometry to obtain the median size of Ferrox dry product.The scanning electron microscope of this Ferrox dry product pattern is illustrated in Fig. 1.
Embodiment 2
With 335 milliliters of ethanol (C
2H
5OH) miscible with 65 ml waters, make mixed solvent (25 ℃ of temperature).Ferrous sulfate (the FeSO of dissolving 556 grams (2 moles) in 2.5 premium on currency
47H
2And, make the pH value of solution value be adjusted to 2.0 O), adding a small amount of sulfuric acid.In 2 premium on currency, dissolve an oxalic acid hydrate potassium (K of 368 grams (2 moles) in addition
2C
2O
4H
2O), and add a small amount of potassium hydroxide (KOH) aqueous solution, make pH value of solution be adjusted to 8.0.With the speed of dripping of 100 ml/min, with drip 2000 milliliters Potassium Oxalate Solution of 20 fens these alcohol mixed solvents of clockwise, with the phase same rate, with drip 2500 milliliters copperas solution of 25 fens these mixed solvents of clockwise.Along with dripping of Potassium Oxalate Solution and copperas solution, Ferrox is separated out (25 ℃ of temperature, pH2.5).
Then, carry out the filtered and recycled Ferrox, the Ferrox that reclaims is washed with 10 premium on currency.
Then, dry 12 hours of the Ferrox after will washing under 80 ℃ obtains 336 gram dry products.With the dry product that X-ray diffraction analysis obtains, its result, diffractogram is consistent with JCPDS figure number 23-0293, therefore confirms that dry product is FeC
2O
42H
2O (yield 93%).
Utilize the ICP optical spectroscopy to obtain the content of Fe, Na, K, Mn, Ni, Co, Ti.In addition, record SO with volumetry
4 2-Content.In addition, utilize laser diffractometry to obtain the median size of Ferrox dry product.The scanning electron microscope of this Ferrox dry product pattern is illustrated in Fig. 2.
Embodiment 3
With 0.8 liter of ethanol (C
2H
5OH) miscible with 0.2 premium on currency, make mixed solvent (25 ℃ of temperature).Ferrous sulfate (the FeSO of dissolving 695 grams (2.5 moles) in 2.5 premium on currency
47H
2And, make the pH value of solution value be adjusted to 1.0 O), adding a small amount of sulfuric acid.In 2.5 premium on currency, dissolve an oxalic acid hydrate potassium (K of 368 grams (2 moles) in addition
2C
2O
4H
2O), and add a small amount of potassium hydroxide (KOH) aqueous solution, make pH value of solution be adjusted to 9.0.With the speed of dripping of 50 ml/min, with drip 2500 milliliters Potassium Oxalate Solution of 50 fens these alcohol mixed solvents of clockwise, with the phase same rate, with drip 2500 milliliters copperas solution of 50 fens these mixed solvents of clockwise.Along with dripping of Potassium Oxalate Solution and copperas solution, Ferrox is separated out (25 ℃ of temperature, pH2.5).
Then, carry out the filtered and recycled Ferrox, the Ferrox that reclaims is washed with 10 premium on currency.
Then, dry 12 hours of the Ferrox after will washing under 80 ℃ obtains 325 gram dry products.With the dry product that X-ray diffraction analysis obtains, its result, diffractogram is consistent with JCPDS figure number 23-0293, therefore confirms that dry product is FeC
2O
42H
2O (yield 90%).
Utilize the ICP optical spectroscopy to obtain the content of Fe, Na, K, Mn, Ni, Co, Ti.In addition, record SO with volumetry
4 2-Content.In addition, utilize laser diffractometry to obtain the median size of Ferrox dry product.The scanning electron microscope of this Ferrox dry product pattern is illustrated in Fig. 3.
Comparative Examples 1
Ferrous sulfate (the FeSO of dissolving 556 grams (2 moles) in 2 premium on currency
47H
2And, make the pH value of solution value be adjusted to 1.8 O), adding a small amount of sulfuric acid.In 2 premium on currency, dissolve an oxalic acid hydrate potassium (K of 368 grams (2 moles) in addition
2C
2O
4H
2O), and add a small amount of potassium hydroxide (KOH) aqueous solution, make pH value of solution be adjusted to 9.0.With the speed of dripping of 50 ml/min, with dripping 2000 milliliters Potassium Oxalate Solution in 40 fens clockwise 1 premium on currency, with the phase same rate, with dripping 2000 milliliters copperas solution in 40 fens this water of clockwise.Along with dripping of Potassium Oxalate Solution and copperas solution, Ferrox is separated out (25 ℃ of temperature, pH2.8).
Then, carry out the filtered and recycled Ferrox, the Ferrox that reclaims is washed with 10 premium on currency.
Then, dry 12 hours of the Ferrox after will washing under 80 ℃ obtains 324 gram dry products.With the dry product that X-ray diffraction analysis obtains, its result, diffractogram is consistent with JCPDS figure number 23-0293, therefore confirms that dry product is FeC
2O
42H
2O (yield 90%).
Utilize the ICP optical spectroscopy to obtain the content of Fe, Na, K, Mn, Ni, Co, Ti.In addition, record 5O with volumetry
4 2-Content.In addition, utilize laser diffractometry to obtain the median size of Ferrox dry product.The scanning electron microscope of this Ferrox dry product pattern is illustrated in Fig. 4.
Comparative Examples 2
With 0.5 liter of ethanol (C
2H
5OH) miscible with 0.5 premium on currency, make mixed solvent (25 ℃ of temperature).Ferrous sulfate (the FeSO of dissolving 556 grams (2 moles) in 2 premium on currency
47H
2And, make the pH value of solution value be adjusted to 1.8 O), adding a small amount of sulfuric acid.In 2 premium on currency, dissolve an oxalic acid hydrate potassium (K of 368 grams (2 moles) in addition
2C
2O
4H
2O), and add a small amount of potassium hydroxide (KOH) aqueous solution, make pH value of solution be adjusted to 8.6.With the speed of dripping of 30 ml/min, with drip 2000 milliliters Potassium Oxalate Solution of 67 fens these alcohol mixed solvents of clockwise, with the phase same rate, with drip 2000 milliliters copperas solution of 67 fens these mixed solvents of clockwise.Along with dripping of Potassium Oxalate Solution and copperas solution, Ferrox is separated out (25 ℃ of temperature, pH2.8).
Then, carry out the filtered and recycled Ferrox, the Ferrox that reclaims is washed with 10 premium on currency.
Then, dry 12 hours of the Ferrox after will washing under 80 ℃ obtains 334 gram dry products.With the dry product that X-ray diffraction analysis obtains, its result, diffractogram is consistent with JCPDS figure number 23-0293, therefore confirms that dry product is FeC
2O
42H
2O (yield 93%).
Utilize the ICP optical spectroscopy to obtain the content of Fe, Na, K, Mn, Ni, Co, Ti.In addition, record SO with volumetry
4 2-Content.In addition, utilize laser diffractometry to obtain the median size of Ferrox dry product.The scanning electron microscope of this Ferrox dry product pattern is illustrated in Fig. 5.
Comparative Examples 3
With 1.0 liters of ethanol (C
2H
5OH) miscible with 0.2 premium on currency, make mixed solvent (25 ℃ of temperature).Ferrous sulfate (the FeSO of dissolving 556 grams (2 moles) in 2 premium on currency
47H
2O), in 2 premium on currency, dissolve an oxalic acid hydrate potassium (K of 368 grams (2 moles) in addition
2C
2O
4H
2O).With the speed of dripping of 30 ml/min, with drip 2000 milliliters Potassium Oxalate Solution of 67 fens these alcohol mixed solvents of clockwise, with the phase same rate, with drip 2000 milliliters copperas solution of 67 fens these mixed solvents of clockwise.Along with dripping of Potassium Oxalate Solution and copperas solution, Ferrox is separated out (25 ℃ of temperature, pH6.7).
Then, carry out the filtered and recycled Ferrox, the Ferrox that reclaims is washed with 10 premium on currency.
Then, dry 12 hours of the Ferrox after will washing under 80 ℃ obtains 340 gram dry products.With the dry product that X-ray diffraction analysis obtains, its result, diffractogram is consistent with JCPDS figure number 23-0293, therefore confirms that dry product is FeC
2O
42H
2O (yield 94%).
Utilize the ICP optical spectroscopy to obtain the content of Fe, Na, K, Mn, Ni, Co, Ti.In addition, record SO with volumetry
4 2-Content.In addition, utilize laser diffractometry to obtain the median size of Ferrox dry product.The scanning electron microscope of this Ferrox dry product pattern is illustrated in Fig. 6.
Table 1
Claims (7)
1. the preparation method of a Ferrox hydrated salt crystal, this method comprises the oxalate aqueous solution and divalent iron salt aqueous solution contact reacts, it is characterized in that, the contact reacts of described oxalate solution and divalent iron salt solution is carried out in the presence of the mixed solvent of organic solvent and water, described organic solvent and water dissolve each other fully, and described organic solvent is one or more in ethanol, ethylene glycol and the acetone; Described oxalate pH value of aqueous solution is adjusted to more than 8; Described divalent iron salt pH value of aqueous solution is adjusted to below 6; And the oxalate aqueous solution is controlled at 1-5 with the pH value that the consumption of the divalent iron salt aqueous solution makes the oxalate aqueous solution contact the slurries that obtain with the divalent iron salt aqueous solution.
2. preparation method according to claim 1, wherein, the contact reacts of the described oxalate aqueous solution and the divalent iron salt aqueous solution is respectively the oxalate aqueous solution and the divalent iron salt aqueous solution to be joined in the mixed solvent of organic solvent and water.
3. preparation method according to claim 1 and 2, wherein, the oxalate in the described oxalate aqueous solution and the mol ratio of the divalent iron salt in the divalent iron salt aqueous solution are 0.5-1; The concentration of the described oxalate aqueous solution is the 0.8-1 mol; The concentration of the described divalent iron salt aqueous solution is the 0.8-1 mol.
4. preparation method according to claim 3, wherein, the oxalate in the described oxalate aqueous solution and the mol ratio of the divalent iron salt in the divalent iron salt aqueous solution are 0.8-1; Described oxalate pH value of aqueous solution is 8-11, described divalent iron salt pH value of aqueous solution is adjusted to 1-3, and the oxalate aqueous solution is controlled at 2-4 with the pH value that the consumption of the divalent iron salt aqueous solution makes the oxalate aqueous solution contact the slurries that obtain with the divalent iron salt aqueous solution.
5. preparation method according to claim 1, wherein, the mixed solvent of described organic solvent and water and the described oxalate aqueous solution and divalent iron salt aqueous solution volume ratio are 1: 4-10; In the described mixed solvent, the volume ratio of organic solvent and water is 2-10.
6. preparation method according to claim 1 and 2, wherein, the described oxalate aqueous solution is one or more the aqueous solution in potassium oxalate, sodium oxalate and the ammonium oxalate, the described divalent iron salt aqueous solution is the aqueous solution of ferrous sulfate and/or iron protochloride.
7. preparation method according to claim 1, wherein, this method also comprises the precipitate and separate with the described oxalate aqueous solution and described divalent iron salt aqueous solution contact reacts gained, with the gained washing of precipitate, dry, and dry described temperature of precipitation is 50-90 ℃, and described washing makes the metal content of the potassium of the Ferrox hydrated salt crystal that obtains after the drying and sodium below 1 weight %.
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3994819A (en) * | 1974-09-13 | 1976-11-30 | Agence Nationale De Valorisation De La Recherche (Anvar) | Method for the preparation of acicular particles containing iron and other divalent metals |
| US4803291A (en) * | 1985-09-30 | 1989-02-07 | Centre National De La Recherche Scientifique | Particulate compositions of ferromagnetic metal oxalates in the form of submicronic acicular particles, the preparation of same and application thereof |
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2006
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3994819A (en) * | 1974-09-13 | 1976-11-30 | Agence Nationale De Valorisation De La Recherche (Anvar) | Method for the preparation of acicular particles containing iron and other divalent metals |
| US4803291A (en) * | 1985-09-30 | 1989-02-07 | Centre National De La Recherche Scientifique | Particulate compositions of ferromagnetic metal oxalates in the form of submicronic acicular particles, the preparation of same and application thereof |
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